1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
|
// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
* TODO: insert short description here
*//*
* Authors: see git history
*
* Copyright (C) 2018 Authors
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
/*
* bulia byak <buliabyak@users.sf.net>
* Tavmjong Bah <tavmjong@free.fr> (Documentation)
*
* Functions to manipulate SPCSSAttr which is a class derived from Inkscape::XML::Node See
* sp-css-attr.h and node.h
*
* SPCSSAttr is a special node type where the "attributes" are the properties in an element's style
* attribute. For example, style="fill:blue;stroke:none" is stored in a List (Inkscape::Util:List)
* where the key is the property (e.g. "fill" or "stroke") and the value is the property's value
* (e.g. "blue" or "none"). An element's properties are manipulated by adding, removing, or
* changing an item in the List. Utility functions are provided to go back and forth between the
* two ways of representing properties (by a string or by a list).
*
* Use sp_repr_css_write_string to go from a property list to a style string.
*
*/
#define SP_REPR_CSS_C
#include <cstring>
#include <string>
#include <sstream>
#include <glibmm/ustring.h>
#include "3rdparty/libcroco/cr-declaration.h"
#include "svg/css-ostringstream.h"
#include "xml/repr.h"
#include "xml/simple-document.h"
#include "xml/sp-css-attr.h"
using Inkscape::XML::SimpleNode;
using Inkscape::XML::Node;
using Inkscape::XML::NodeType;
using Inkscape::XML::Document;
struct SPCSSAttrImpl : public SimpleNode, public SPCSSAttr {
public:
SPCSSAttrImpl(Document *doc)
: SimpleNode(g_quark_from_static_string("css"), doc) {}
SPCSSAttrImpl(SPCSSAttrImpl const &other, Document *doc)
: SimpleNode(other, doc) {}
NodeType type() const override { return Inkscape::XML::NodeType::ELEMENT_NODE; }
protected:
SimpleNode *_duplicate(Document* doc) const override { return new SPCSSAttrImpl(*this, doc); }
};
static void sp_repr_css_add_components(SPCSSAttr *css, Node const *repr, gchar const *attr);
/**
* Creates an empty SPCSSAttr (a class for manipulating CSS style properties).
*/
SPCSSAttr *sp_repr_css_attr_new()
{
static Inkscape::XML::Document *attr_doc=nullptr;
if (!attr_doc) {
attr_doc = new Inkscape::XML::SimpleDocument();
}
return new SPCSSAttrImpl(attr_doc);
}
/**
* Unreferences an SPCSSAttr (will be garbage collected if no references remain).
*/
void sp_repr_css_attr_unref(SPCSSAttr *css)
{
g_assert(css != nullptr);
Inkscape::GC::release((Node *) css);
}
/**
* Creates a new SPCSSAttr with one attribute (i.e. style) copied from an existing repr (node). The
* repr attribute data is in the form of a char const * string (e.g. fill:#00ff00;stroke:none). The
* string is parsed by libcroco which returns a CRDeclaration list (a typical C linked list) of
* properties and values. This list is then used to fill the attributes of the new SPCSSAttr.
*/
SPCSSAttr *sp_repr_css_attr(Node const *repr, gchar const *attr)
{
g_assert(repr != nullptr);
g_assert(attr != nullptr);
SPCSSAttr *css = sp_repr_css_attr_new();
sp_repr_css_add_components(css, repr, attr);
return css;
}
/**
* Adds an attribute to an existing SPCSAttr with the cascaded value including all parents.
*/
static void sp_repr_css_attr_inherited_recursive(SPCSSAttr *css, Node const *repr, gchar const *attr)
{
const Node *parent = repr->parent();
// read the ancestors from root down, using head recursion, so that children override parents
if (parent) {
sp_repr_css_attr_inherited_recursive(css, parent, attr);
}
sp_repr_css_add_components(css, repr, attr);
}
/**
* Creates a new SPCSSAttr with one attribute whose value is determined by cascading.
*/
SPCSSAttr *sp_repr_css_attr_inherited(Node const *repr, gchar const *attr)
{
g_assert(repr != nullptr);
g_assert(attr != nullptr);
SPCSSAttr *css = sp_repr_css_attr_new();
sp_repr_css_attr_inherited_recursive(css, repr, attr);
return css;
}
/**
* Adds components (style properties) to an existing SPCSAttr from the specified attribute's data
* (nominally a style attribute).
*
*/
static void sp_repr_css_add_components(SPCSSAttr *css, Node const *repr, gchar const *attr)
{
g_assert(css != nullptr);
g_assert(repr != nullptr);
g_assert(attr != nullptr);
char const *data = repr->attribute(attr);
sp_repr_css_attr_add_from_string(css, data);
}
/**
* Returns a character string of the value of a given style property or a default value if the
* attribute is not found.
*/
char const *sp_repr_css_property(SPCSSAttr *css, gchar const *name, gchar const *defval)
{
g_assert(css != nullptr);
g_assert(name != nullptr);
char const *attr = ((Node *)css)->attribute(name);
return ( attr == nullptr
? defval
: attr );
}
/**
* Returns a character string of the value of a given style property or a default value if the
* attribute is not found.
*/
Glib::ustring sp_repr_css_property(SPCSSAttr *css, Glib::ustring const &name, Glib::ustring const &defval)
{
g_assert(css != nullptr);
Glib::ustring retval = defval;
char const *attr = ((Node *)css)->attribute(name.c_str());
if (attr) {
retval = attr;
}
return retval;
}
/**
* Returns true if a style property is present and its value is unset.
*/
bool sp_repr_css_property_is_unset(SPCSSAttr *css, gchar const *name)
{
g_assert(css != nullptr);
g_assert(name != nullptr);
char const *attr = ((Node *)css)->attribute(name);
return (attr && !strcmp(attr, "inkscape:unset"));
}
/**
* Set a style property to a new value (e.g. fill to #ffff00).
*/
void sp_repr_css_set_property(SPCSSAttr *css, gchar const *name, gchar const *value)
{
g_assert(css != nullptr);
g_assert(name != nullptr);
((Node *) css)->setAttribute(name, value);
}
/**
* Set a style property to "inkscape:unset".
*/
void sp_repr_css_unset_property(SPCSSAttr *css, gchar const *name)
{
g_assert(css != nullptr);
g_assert(name != nullptr);
((Node *) css)->setAttribute(name, "inkscape:unset");
}
/**
* Return the value of a style property if property define, or a default value if not.
*/
double sp_repr_css_double_property(SPCSSAttr *css, gchar const *name, double defval)
{
g_assert(css != nullptr);
g_assert(name != nullptr);
return css->getAttributeDouble(name, defval);
}
/**
* Set a style property to a new float value (e.g. opacity to 0.5).
*/
void sp_repr_css_set_property_double(SPCSSAttr *css, gchar const *name, double value)
{
g_assert(css != nullptr);
g_assert(name != nullptr);
((Node *) css)->setAttributeCssDouble(name, value);
}
/**
* Write a style attribute string from a list of properties stored in an SPCSAttr object.
*/
void sp_repr_css_write_string(SPCSSAttr *css, Glib::ustring &str)
{
str.clear();
for (const auto & iter : css->attributeList())
{
if (iter.value && !strcmp(iter.value, "inkscape:unset")) {
continue;
}
if (!str.empty()) {
str.push_back(';');
}
str.append(g_quark_to_string(iter.key));
str.push_back(':');
str.append(iter.value); // Any necessary quoting to be done by calling routine.
}
}
/**
* Sets an attribute (e.g. style) to a string created from a list of style properties.
*/
void sp_repr_css_set(Node *repr, SPCSSAttr *css, gchar const *attr)
{
g_assert(repr != nullptr);
g_assert(css != nullptr);
g_assert(attr != nullptr);
Glib::ustring value;
sp_repr_css_write_string(css, value);
/*
* If the new value is different from the old value, this will sometimes send a signal via
* CompositeNodeObserver::notiftyAttributeChanged() which results in calling
* SPObject::repr_attr_changed and thus updates the object's SPStyle. This update
* results in another call to repr->setAttribute().
*/
repr->setAttributeOrRemoveIfEmpty(attr, value);
}
/**
* Loops through a List of style properties, printing key/value pairs.
*/
void sp_repr_css_print(SPCSSAttr *css)
{
for ( const auto & attr: css->attributeList() )
{
gchar const * key = g_quark_to_string(attr.key);
gchar const * val = attr.value;
g_print("%s:\t%s\n",key,val);
}
}
/**
* Merges two SPCSSAttr's. Properties in src overwrite properties in dst if present in both.
*/
void sp_repr_css_merge(SPCSSAttr *dst, SPCSSAttr *src)
{
g_assert(dst != nullptr);
g_assert(src != nullptr);
dst->mergeFrom(src, "");
}
/**
* Merges style properties as parsed by libcroco into an existing SPCSSAttr.
* libcroco converts all single quotes to double quotes, which needs to be
* undone as we always use single quotes inside our 'style' strings since
* double quotes are used outside: e.g.:
* style="font-family:'DejaVu Sans'"
*/
static void sp_repr_css_merge_from_decl(SPCSSAttr *css, CRDeclaration const *const decl)
{
guchar *const str_value_unsigned = cr_term_to_string(decl->value);
css->setAttribute(decl->property->stryng->str, reinterpret_cast<char const *>(str_value_unsigned));
g_free(str_value_unsigned);
}
/**
* Merges style properties as parsed by libcroco into an existing SPCSSAttr.
*
* \pre decl_list != NULL
*/
static void sp_repr_css_merge_from_decl_list(SPCSSAttr *css, CRDeclaration const *const decl_list)
{
// read the decls from start to end, using tail recursion, so that latter declarations override
// (Ref: http://www.w3.org/TR/REC-CSS2/cascade.html#cascading-order point 4.)
// because sp_repr_css_merge_from_decl sets properties unconditionally
sp_repr_css_merge_from_decl(css, decl_list);
if (decl_list->next) {
sp_repr_css_merge_from_decl_list(css, decl_list->next);
}
}
/**
* Use libcroco to parse a string for CSS properties and then merge
* them into an existing SPCSSAttr.
*/
void sp_repr_css_attr_add_from_string(SPCSSAttr *css, gchar const *p)
{
if (p != nullptr) {
CRDeclaration *const decl_list
= cr_declaration_parse_list_from_buf(reinterpret_cast<guchar const *>(p), CR_UTF_8);
if (decl_list) {
sp_repr_css_merge_from_decl_list(css, decl_list);
cr_declaration_destroy(decl_list);
}
}
}
/**
* Creates a new SPCSAttr with the values filled from a repr, merges in properties from the given
* SPCSAttr, and then replaces that SPCSAttr with the new one. This is called, for example, for
* each object in turn when a selection's style is updated via sp_desktop_set_style().
*/
void sp_repr_css_change(Node *repr, SPCSSAttr *css, gchar const *attr)
{
g_assert(repr != nullptr);
g_assert(css != nullptr);
g_assert(attr != nullptr);
SPCSSAttr *current = sp_repr_css_attr(repr, attr);
sp_repr_css_merge(current, css);
sp_repr_css_set(repr, current, attr);
sp_repr_css_attr_unref(current);
}
void sp_repr_css_change_recursive(Node *repr, SPCSSAttr *css, gchar const *attr)
{
g_assert(repr != nullptr);
g_assert(css != nullptr);
g_assert(attr != nullptr);
sp_repr_css_change(repr, css, attr);
for (Node *child = repr->firstChild(); child != nullptr; child = child->next()) {
sp_repr_css_change_recursive(child, css, attr);
}
}
/**
* Return a new SPCSSAttr with all the properties found in the input SPCSSAttr unset.
*/
SPCSSAttr* sp_repr_css_attr_unset_all(SPCSSAttr *css)
{
SPCSSAttr* css_unset = sp_repr_css_attr_new();
for ( const auto & iter : css->attributeList() ) {
sp_repr_css_set_property (css_unset, g_quark_to_string(iter.key), "inkscape:unset");
}
return css_unset;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
|